CN104259382A - Yoke casting method - Google Patents
Yoke casting method Download PDFInfo
- Publication number
- CN104259382A CN104259382A CN201410514706.XA CN201410514706A CN104259382A CN 104259382 A CN104259382 A CN 104259382A CN 201410514706 A CN201410514706 A CN 201410514706A CN 104259382 A CN104259382 A CN 104259382A
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- China
- Prior art keywords
- casting
- ceramic
- liquid binder
- colloidal liquid
- particle
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Abstract
The invention relates to a yoke casting method. The yoke casting method is characterized by using ceramic wearproof particles instead of refractory materials, coating the surface of a die set with a liquid coating prepared from the ceramic wearproof particles and a binder to prepare a pattern die, fusing a fusible die, injecting alloy liquid, forming a casting along with cooling and solidification of the injected alloy liquid, introducing the ceramic wearproof particles in the surface of the casting and then carrying out heat treatment, so that a ceramic hardening layer is added to the surface of the casting, thus improving the surface hardness of the casting. By adopting the casting method provided by the invention, the casting is formed once, has a smooth and clean surface and is accurate in dimension, and the aim of less cutting or no cutting can be achieved; the surface of the casting is provided with the ceramic hardening layer, so that the hardness is greatly improved; therefore the method is especially suitable for preparing alloy castings requiring higher surface hardness, such as yokes, and the like.
Description
The application is the divisional application proposed based on China's application (2012104057300)
Technical field
The present invention relates to a kind of casting method, specifically, relate to a kind of yoke casting method.
Background technology
Yoke is generally adopt high strength steel, and be first processed as yoke base, then carry out the technical process such as machining, the processing of yoke shape, heat treatment, fine finishining and make, process cycle is long, and processing technology complexity, machined difficulty is large.And requiring that obtained yoke torsional fatigue strength is high, case hardness is high, and wearability is good.
Casting is one of main method of manufactured parts blank, preparation method quite efficiently, especially for the part of some brittle metal or alloy material, the processing method that foundry engieering is commonly used especially, its forming principle is: METAL HEATING PROCESS melted, make it have mobility, be then poured in the effigurate casting mold die cavity of tool, under the effect of gravity or external force, be full of die cavity, cool and be frozen into foundry goods or part.
Traditional casting technique generally comprises following steps: a, make the apperance of molding and core making according to the shape of product; B, apperance is put into sandbox, carry out mould assembling after back-up sand, consolidation, molding; C, by fusing after liquid metal be poured in the die cavity in sandbox; D, peeling foundry goods.
At present, traditional casting technique all needs a large amount of manpowers when the preparation of molding sand, in the manufacturing process of sand mold and in the peeling foundry goods in later stage, and labour intensity is comparatively large, wastes a large amount of valuable human resources, cast each product to need to repeat above-mentioned operation, production efficiency is low simultaneously.
Based on above-mentioned defect, the present invention is directed to the feature of yoke, a kind of yoke casting method of improvement is provided.
Summary of the invention
The object of this invention is to provide a kind of casting method that can be used for yoke.
Casting method of the present invention is the investment casting method improved, and model casting is also known as " lost-wax casting ".This method is that easy fusible pattern material is injected die mould (mould), make fusible pattern, it is assembled into module, then at the liquid coating that module surface application refractory material and binding agent are made into, on coating, spread fire-resistant sand grains again, make it subsequently to harden into shell.So repeated multiple times, just form multilayer shell.Heated by shell, fusible pattern is melted and flows out, housing, after roasting, toward wherein pouring into liquid alloy, namely obtains foundry goods through operations such as cleanings after solidifying.
Based on the requirement to yoke, namely torsional fatigue strength is high, and case hardness is high, wearability is good, the present invention is using ceramic wear-resisting particle as refractory material, and the liquid coating that binding agent is made into is coated in module surface, makes pattern, inject alloy liquid, along with the cooled and solidified of the alloy liquid injected forms foundry goods, ceramic wear-resisting particle is introduced cast(ing) surface, then heat treatment, make cast(ing) surface increase one deck pottery hardened layer, improve the case hardness of foundry goods.
Specifically, the casting method described in invention, comprises the following steps:
1) preformed fusible model is immersed in the slurry of ceramic particle and colloidal liquid binder formation, described model forms coating, dry;
2) to step 1) described coating on the slurry that forms of sprayable refractory particle or applying of refractory material particle and colloidal liquid binder, dry;
3) molten mistake fusible pattern, Baking;
4) alloyage material, alloy material melting, cast;
5) clear up: comprise shelling, remove the processing steps such as dead head, cleaning, inspection, soldering;
6) heat treating castings.
Described colloidal liquid binder is one or both mixture of polyacrylamide and polyacrylate;
In the slurry that ceramic particle and colloidal liquid binder are formed, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1-10; Preferred 1:0.3-1.
Adopt model casting, foundry goods is once-forming, and any surface finish, size are accurate, can reach few cutting or without the object of cutting, and surface has ceramic hardened layer, and hardness improves greatly, is particularly suitable for preparing the alloy-steel casting that gear etc. needs high surfaces hardness.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further.As without specializing, the present invention's raw material used is commercial.
Embodiment 1
According to following steps, casting yoke sample:
1) preformed fusible model is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, spraying dry; Described ceramic particle can be carborundum, silicon nitride or tungsten carbide, and the size of particle is 20-50 μm; Described colloidal liquid binder is polyacrylamide; In the slurry that ceramic particle and colloidal liquid binder are formed, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1;
Wherein, step 1) repeat 3 times;
2) to step 1) described coating on the slurry that forms of applying of refractory material particle and colloidal liquid binder, spraying dry; Wherein, described refractory material is silica; The weight ratio that described fire resisting material particle and gelling form material is 100:5;
Wherein, step 2) repeat 2 times;
3) 200 DEG C of insulations, 1 hour molten mistake fusible pattern, Baking; ;
4) alloyage material, chemical composition is in table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1580 DEG C, and pouring temperature is 1530 DEG C;
Table 1 chemical component table
5) clear up: comprise shelling, remove the processing steps such as dead head, cleaning, inspection, soldering;
6) heat treating castings: 860 DEG C insulation 1 hour after oil quenching, 500 DEG C insulation 1 hour after cool with stove.
Embodiment 2
According to following steps, cast gear sample:
1) preformed fusible model is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, spraying dry; Described ceramic particle is the mixture of silicon nitride and tungsten carbide (weight ratio 10:1), and the size of particle is 100-200 μm; Described colloidal liquid binder is polyacrylate; In the slurry that ceramic particle and colloidal liquid binder are formed, the weight ratio of ceramic particle and colloidal liquid binder is 1:10;
Wherein, step 1) repeat 5 times;
2) to step 1) described coating on the slurry that forms of applying of refractory material particle and colloidal liquid binder, spraying dry; Wherein, described refractory material is magnesia; The weight ratio that described fire resisting material particle and gelling form material is 100:10;
Wherein, step 2) repeat 3 times;
3) 400 DEG C of insulations, 1 hour molten mistake fusible pattern, Baking; ;
4) alloyage material, chemical composition is in table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1620 DEG C, and pouring temperature is 1560 DEG C;
5) clear up: comprise shelling, remove the processing steps such as dead head, cleaning, inspection, soldering;
6) heat treating castings.Step 6) heat treatment of medium casting can carry out as follows: 900 DEG C of insulations oil quenching after 3 hours, 600 DEG C of insulations cooled with stove after 3 hours.
Embodiment 3
According to following steps, cast gear sample:
1) preformed fusible model is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, spraying dry; Described ceramic particle is tungsten carbide, and the size of particle is 50-100 μm; Described colloidal liquid binder is the mixture of polyacrylamide and polyacrylate; In the slurry that ceramic particle and colloidal liquid binder are formed, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.5;
Wherein, step 1) repeat 3 times;
2) to step 1) described coating on the slurry that forms of applying of refractory material particle and colloidal liquid binder, spraying dry; Wherein, described refractory material is aluminium oxide; The weight ratio that described fire resisting material particle and gelling form material is 100:1;
Wherein, step 2) repeat 2 times;
3) 300 DEG C of insulations, 2 hours molten mistake fusible patterns, Baking; ;
4) alloyage material, chemical composition is in table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1600 DEG C, and pouring temperature is 1550 DEG C;
5) clear up: comprise shelling, remove the processing steps such as dead head, cleaning, inspection, soldering;
6) heat treating castings: 880 DEG C insulation 2 hours after oil quenching, 550 DEG C insulation 1 hour after cool with stove.
Embodiment 4
According to following steps, cast gear sample:
1) preformed fusible model is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, spraying dry; Described ceramic particle is carborundum, and the size of particle is 40-80 μm; Described colloidal liquid binder is polyacrylamide; In the slurry that ceramic particle and colloidal liquid binder are formed, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.3;
Wherein, step 1) repeat 3 times;
2) to step 1) described coating on sprayable refractory particle; Wherein, described refractory material is the mixture of silica and aluminium oxide;
3) 280 DEG C of insulations, 2 hours molten mistake fusible patterns, Baking;
4) alloyage material, chemical composition is in table 1, and alloy material utilizes vacuum induction melting, fusion temperature: 1620 DEG C, and pouring temperature is 1530 DEG C;
5) clear up: comprise shelling, remove the processing steps such as dead head, cleaning, inspection, soldering;
6) heat treating castings: 900 DEG C insulation 1 hour after oil quenching, 500 DEG C insulation 1.5 hours after cool with stove.
Diametrically sample gear prepared by embodiment 1-4, sample carries out torsional fatigue strength test, and employing torque capacity is the reverse torsion machine of 4900Nm (=500kgf.m), and alternation ground changes stress condition and carries out, reaching 1 × 10
5stress during the secondary life-span is tried to achieve as fatigue strength.
In addition, to the sample made with the same terms, adopt thickness and the hardness of light microscope determining hardened layer.The results are shown in Table 2:
The test result of table 2 sample
The present invention adopts investment casting method, and foundry goods is once-forming, and any surface finish, size are accurate, few cutting or the object without cutting can be reached, and surface has ceramic hardened layer, hardness improves greatly, is particularly suitable for preparing the alloy-steel casting that gear etc. needs high surfaces hardness.
Claims (2)
1. yoke casting method, is characterized in that, comprises the following steps:
1) preformed fusible model is immersed in the slurry of ceramic particle and colloidal liquid binder formation, on described model, form coating whereby, dry;
2) to step 1) described coating on the slurry that forms of sprayable refractory particle or applying of refractory material particle and colloidal liquid binder, dry;
3) molten mistake fusible pattern, Baking;
4) alloyage material, alloy material melting, cast;
5) clear up: comprise shelling, remove the processing steps such as dead head, cleaning, inspection, soldering;
6) heat treating castings;
Described colloidal liquid binder is one or both mixture of polyacrylamide and polyacrylate.
2. gear casting method according to claim 1, is characterized in that, in the slurry that ceramic particle and colloidal liquid binder are formed, the weight ratio of ceramic particle and colloidal liquid binder is 1:0.1-10; Preferred 1:0.3-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410514706.XA CN104259382A (en) | 2012-10-22 | 2012-10-22 | Yoke casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410514706.XA CN104259382A (en) | 2012-10-22 | 2012-10-22 | Yoke casting method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210405730.0A Division CN102861873B (en) | 2012-10-22 | 2012-10-22 | Casting method of gear |
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| Publication Number | Publication Date |
|---|---|
| CN104259382A true CN104259382A (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410514706.XA Pending CN104259382A (en) | 2012-10-22 | 2012-10-22 | Yoke casting method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913991A (en) * | 2004-02-05 | 2007-02-14 | 伯明翰大学 | Improved investment casting process |
| CN102430743A (en) * | 2011-12-01 | 2012-05-02 | 昆明理工大学 | Method for preparing surface-layer composite by using cast-infiltration method |
| CN102489486A (en) * | 2011-12-23 | 2012-06-13 | 楚天科技股份有限公司 | Feeding device for rubber plug cleaning device |
| JP2012161805A (en) * | 2011-02-04 | 2012-08-30 | Hitachi Metals Ltd | Ceramic core and method for manufacturing the same |
-
2012
- 2012-10-22 CN CN201410514706.XA patent/CN104259382A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913991A (en) * | 2004-02-05 | 2007-02-14 | 伯明翰大学 | Improved investment casting process |
| JP2012161805A (en) * | 2011-02-04 | 2012-08-30 | Hitachi Metals Ltd | Ceramic core and method for manufacturing the same |
| CN102430743A (en) * | 2011-12-01 | 2012-05-02 | 昆明理工大学 | Method for preparing surface-layer composite by using cast-infiltration method |
| CN102489486A (en) * | 2011-12-23 | 2012-06-13 | 楚天科技股份有限公司 | Feeding device for rubber plug cleaning device |
Non-Patent Citations (1)
| Title |
|---|
| 姜不居: "《实用熔模铸造技术》", 31 March 2008, article "实用熔模铸造技术", pages: 1-3,69-70,74-75,90,286 * |
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Application publication date: 20150107 |
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